Question

Solids ___________ on heating and __________ on cooling.

• A. Expand
• B. Contract.

Answer 1

1. Solid is one of the four fundamental states of matter (the others being liquid, gas, and plasma).
2. The molecules in a solid are closely packed together
3. Solids are known to expand on heating. It is called Thermal expansion.
4. Solid is also known to contract on cooling. It is called Contraction.

Hence the answers are: Solids expand on heating and contract on cooling.